Make a boxed yellow cake stiffer than usual. Use only 1/3 cup water. Grease jelly roll pan and spread batter in it. Sprinkle 3 cups (1 pint) blueberries over batter. Mix: 1/2 c. sugar 4 tbsp. melted butter Cinnamon

Make crumb mixture and sprinkle over blueberries. Bake at 350 degrees for 20 to 25 minutes. Sprinkle powdered sugar over cake when cool.